PYL1 — Arabidopsis thaliana

Summary

AT5G46790, also known as PYL1, PYR1-like 1, or RCAR12, encodes a protein with abscisic acid binding, protein phosphatase inhibitor, and kinase regulator activities, belonging to the START-like domain superfamily. In Arabidopsis, PYL1 is associated with heat tolerance, ABA-mediated signaling, and responses to drought and salinity. It has been linked to the regulation of seed dormancy, germination, lateral root branching, starch metabolism, and TOR signaling. The protein localizes to the cytosol, nucleus, tonoplast, and plasma membrane. Associations with traits such as drought recovery, water use efficiency, biomass yield, seed yield, vegetative vigor, and transpiration rate have been reported. Studies of related genes in other species link the PYL1 family to fruit development, adventitious root formation, and abiotic stress responses.